Jaxey's Master
Book 4 in the More Than Male series.

Jaxey is only the second female ever to attend the elite Guardian Training Academy. She is smart and strong and beautiful and designed to hold her own against any primale. Her only weakness is Korlon, her gorgeous classmate. The two are irresistibly attracted, despite Korlon's engagement to the obedient Desela.

When a training mission puts Korlon and Jaxey into deep space alone, all bets are off, especially when Jaxey discovers it's not just sex-making she desires, but complete submission to Korlon as her lord and Master.

A Dominant for Desela
This is book 5 in the More Than Male series.

Following a broken engagement, the beautiful and obedient Desela has vowed never to love again. Instead she dedicates herself to helping other obedient females find dominant mates.

When her matchmaking service leads her to a remote colony run by the rugged Marshal Trajan, however, she soon finds her submissive instincts stirring. Trajan wants nothing to do with Des or her service, but the harder he tries to repel her, the more he wants her in his bed and at his feet. Desela fights, but she is born to yield to the one man strong enough to take her on his terms.